# US 5,704,980 A · Method of and apparatus for making plastic film with barrier layers

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- Number: US 5,704,980 A
- Document ID: US5704980A
- Status: Granted
- Kind: A
- Application number: 08/640,095
- Filed: 1996-04-30
- Granted: 1998-01-06
- Earliest claimed: 1994-09-29
- Assignees: CE.TE.V. Centro Technologie Del Vuoto
- Inventors: Carlo Misiano; Enrico Simonetti; Francesco Staffeti
- Web page: https://patentgrep.com/patent/US5704980A

## CPC

- C23C 14/5826: {Treatment with charged particles (C23C14/582 takes precedence)}
- C23C 14/0042: {Controlling partial pressure or flow rate of reactive or inert gases with feedback of measurements}
- C23C 14/20: on organic substrates
- C23C 14/548: {Controlling the composition}
- C23C 14/562: {for coating elongated substrates}
- C23C 14/5853: {Oxidation}
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)

## Abstract

A plastic wrapping film is provided with one or more aluminum layers by vapor deposition and the or each layer is only partially oxidized in an oxidizing plasma so that the resulting barrier layer is distinguishable by slight reduction in transparency but excellent prevention of penetration by moisture and oxygen.

## Claims

### Claim 1

An apparatus for producing a plastic wrap which comprises:
means for depositing upon a plastic film in a succession of stages, respective aluminum layers;
means for partially oxidizing each of said aluminum layers; and
control means for regulating oxidation of each of said aluminum layers so each of said aluminum layers is only partially oxidized.

### Claim 2 (depends on 1)

The apparatus defined in claim 1 wherein said control means includes a timer.

### Claim 3 (depends on 1)

The apparatus defined in claim 1 wherein said control means includes means for monitoring light absorption of said layers subsequent to partial oxidation.